Espresso machine



FIG. 1 is a perspective view front and right side view of an espresso machine, showing my new design;

FIG. 2 is a perspective view of the back and a view of the right side seen from the front;

FIG. 3 is a perspective front and top view onto the left side seen from the front; and,

FIG. 4 is a perspective bottom view and a left side view seen from the front. 

The ornamental design for an espresso machine, as shown. 